WO2014132967A1 - Système de communication, commutateur, appareil de commande, procédé et programme de configuration de canal de commande - Google Patents

Système de communication, commutateur, appareil de commande, procédé et programme de configuration de canal de commande Download PDF

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Publication number
WO2014132967A1
WO2014132967A1 PCT/JP2014/054568 JP2014054568W WO2014132967A1 WO 2014132967 A1 WO2014132967 A1 WO 2014132967A1 JP 2014054568 W JP2014054568 W JP 2014054568W WO 2014132967 A1 WO2014132967 A1 WO 2014132967A1
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Prior art keywords
switch
control
packet
control device
layer
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PCT/JP2014/054568
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English (en)
Japanese (ja)
Inventor
孝裕 大島
飛 高
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日本電気株式会社
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Priority to JP2015502936A priority Critical patent/JP5987971B2/ja
Priority to US14/766,008 priority patent/US9628376B2/en
Priority to EP14756566.7A priority patent/EP2963869A4/fr
Publication of WO2014132967A1 publication Critical patent/WO2014132967A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4604—LAN interconnection over a backbone network, e.g. Internet, Frame Relay
    • H04L12/462—LAN interconnection over a bridge based backbone
    • H04L12/4625—Single bridge functionality, e.g. connection of two networks over a single bridge
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
    • H04L41/0668—Management of faults, events, alarms or notifications using network fault recovery by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/40—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks using virtualisation of network functions or resources, e.g. SDN or NFV entities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
    • H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/20—Arrangements for monitoring or testing data switching networks the monitoring system or the monitored elements being virtualised, abstracted or software-defined entities, e.g. SDN or NFV
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/38—Flow based routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/42—Centralised routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/74—Address processing for routing

Definitions

  • the present invention is based on the priority claim of Japanese Patent Application No. 2013-036091 (filed on Feb. 26, 2013), the entire contents of which are incorporated herein by reference. Shall.
  • the present invention relates to a communication system, a switch, a control device, and a control channel construction method and program, and more particularly, to a centralized control communication system, switch, control device, control channel construction method and program having a control device.
  • a network in which a packet transfer function of a network device and a control function such as route control are separated has attracted attention.
  • the network device is responsible for the packet transfer function, and the controller separated outside the network device is responsible for the control function. In this way, it becomes possible to construct a network that is easy to control and rich in flexibility.
  • Non-Patent Documents 1 and 2 propose a technique called OpenFlow that realizes the centralized control network.
  • OpenFlow captures communication as an end-to-end flow and performs path control, failure recovery, load balancing, and optimization on a per-flow basis.
  • the OpenFlow switch specified in Non-Patent Document 2 includes a secure channel for communication with the OpenFlow controller, and operates according to a flow table that is appropriately added or rewritten from the OpenFlow controller. For each flow, a set of match conditions (Match Fields), flow statistical information (Counters), and instructions (Instructions) that define processing contents are defined for each flow (non-patented). (Refer to “5.2 Flow Table” in Document 2).
  • the OpenFlow switch searches the flow table for an entry having a matching condition (see “5.3 Matching” in Non-Patent Document 2) that matches the header information of the received packet. If an entry that matches the received packet is found as a result of the search, the OpenFlow switch updates the flow statistical information (counter) and processes the processing (designated) in the instruction field of the entry for the received packet. Perform packet transmission, flooding, discard, etc. from the port. On the other hand, if no entry matching the received packet is found as a result of the search, the OpenFlow switch sends an entry setting request to the OpenFlow controller via the secure channel, that is, a control for processing the received packet. An information transmission request (Packet-In message) is transmitted. The OpenFlow switch receives a flow entry whose processing content is defined and updates the flow table. As described above, the OpenFlow switch performs packet transfer using the entry stored in the flow table as control information.
  • a matching condition see “5.3 Matching” in Non-Patent Document 2
  • the OpenFlow switch updates the flow statistical information (counter
  • Non-Patent Document 3 a control channel is accommodated in a data network between switches without providing a control network (hereinafter referred to as “In-band control method”.
  • In-band control method For example, Non-Patent Document 3 Reference.
  • Non-Patent Documents 1 and 2 high reliability is required for a control channel between a control device and a switch.
  • the switch that has been controlled via the control channel is removed from the control target of the control device and becomes uncontrollable.
  • a communication failure is caused even in a state where it is connected to the data channel link.
  • LAG Link Aggregation
  • Non-Patent Document 3 it is necessary to add a function that causes each switch to interpret a special frame. Further, Non-Patent Document 3 only states that the fault tolerance can be improved by periodically repeating the topology search.
  • the present invention provides a communication system, a switch, a control device, a control channel construction method, and a program that provide automatic recovery means when disconnecting the control channel of the centralized control network and can contribute to improvement of fault tolerance.
  • the purpose is to provide.
  • a control device that controls the switch by setting control information in the switch via a control channel, and a packet that processes a received packet based on the control information set from the control device
  • a control unit learns a control packet input port between the control device and another switch, and based on the learning result, detects a disconnection of the control channel and a layer 2 transfer unit that transfers the control packet
  • a packet requesting resolution of the layer 2 address of the control device is transmitted to the adjacent switch, the layer 2 address is acquired from the control device via the adjacent switch, and the acquired layer 2 address is acquired.
  • an alternative control channel configuration unit that configures a second control channel with the control device using a switch. Communication system is provided.
  • a packet processing unit that processes a received packet based on control information set from a control device that controls the switch by setting control information in the switch via a control channel; Learning the input port of the control packet between the control device and the other switch, based on the learning result, adjacent to the layer 2 forwarding unit that forwards the control packet and detecting the disconnection of the control channel A packet requesting resolution of the layer 2 address of the control device is transmitted to the switch, a layer 2 address is acquired from the control device via the adjacent switch, and the control is performed using the acquired layer 2 address.
  • a switch comprising an alternative control channel configuration unit that configures a second control channel with the device.
  • a control device that configures the second control channel in response to a request from the switch that detects the disconnection of the control channel.
  • a packet processing unit that processes a received packet based on control information set from a control device that controls the switch by setting control information in the switch via a control channel;
  • a switch that learns an input port of a control packet between the control device and another switch, and that has a layer 2 forwarding unit that forwards the control packet based on the learning result, detects the disconnection of the control channel
  • a step of transmitting a packet requesting resolution of a layer 2 address of the control device to an adjacent switch, a step of acquiring a layer 2 address from the control device via the adjacent switch, and the acquired Configuring a second control channel with the control device using a layer 2 address, for control How to build a Yaneru is provided.
  • the method is associated with a specific machine, a switch that processes received packets based on control information set via a control channel.
  • a packet processing unit that processes a received packet based on control information set from a control device that controls the switch by setting control information in the switch via a control channel;
  • the control channel is connected to a computer mounted on a switch comprising a layer 2 forwarding unit that learns an input port of a control packet between the control device and another switch and forwards the control packet based on the learning result.
  • processing for transmitting a packet requesting resolution of the layer 2 address of the control device to an adjacent switch and processing for acquiring a layer 2 address from the control device via the adjacent switch And a process of configuring a second control channel with the control device using the acquired layer 2 address;
  • Program to be executed is provided.
  • This program can be recorded on a computer-readable (non-transient) storage medium. That is, the present invention can be embodied as a computer program product.
  • the switches 10A and 10B are set. It can be realized by a communication system including a control device 20A for controlling the control.
  • the switch 10A (10B) includes a packet processing unit 12 that processes a received packet based on control information set by the control device 20A, and an input of a control packet between the control device and another switch.
  • a layer 2 transfer unit 13 that learns a port and transfers the control packet based on the learning result, and an alternative control channel configuration unit 14 are provided.
  • the alternative control channel configuration unit 14 transmits a packet requesting resolution of the layer 2 address of the control device to an adjacent switch (see FIG. 2).
  • the alternative control channel configuration unit 14 uses the acquired layer 2 address to communicate with the control device.
  • a second control channel is formed between them (see FIG. 5). Note that the control packet between the switch that has detected the disconnection of the control channel and the control device 20A is relayed by the layer 2 transfer unit 13 of the switch on the second control channel.
  • FIG. 6 is a diagram illustrating a configuration of the communication system according to the first embodiment.
  • a plurality of switches 10-1 to 10-4 and a control device 20 that controls these switches 10-1 to 10-4 are shown.
  • the switches 10-1 to 10-4 are connected by a link indicated by a solid line in FIG.
  • the switches 10-1 to 10-4 and the control device 20 are connected by a control channel indicated by a broken line in FIG.
  • the reference numeral # 1-1 in FIG. 6 represents the port numbers of the switches 10-1 to 10-4.
  • FIG. 7 is a diagram showing a configuration of the switch according to the first embodiment (hereinafter referred to as “switch 10” when the switches 10-1 to 10-4 are not particularly distinguished).
  • switch 10 a configuration including a control information storage unit 11, a packet processing unit 12, a layer 2 transfer unit 13, an alternative control channel configuration unit 14, and a protocol processing unit 15 is shown.
  • 7 is a port number corresponding to FIG. 6,
  • LOCAL is a local port inside the switch connected to the alternative control channel configuration unit 14, and NORMAL is a layer 2 transfer unit 13 The normal port inside the switch connected to is shown.
  • the control information storage unit 11 stores control information (flow entry) transmitted from the control device 20.
  • FIG. 8 is an example of a table that stores control information (flow entry).
  • the control information (flow entry) is a process that is applied to a matching condition that is matched with the header of the received packet, and a packet that matches the matching condition.
  • the instruction that defines the contents and the priority indicating the priority order of each control information are associated with each other.
  • the packet processing unit 12 searches the control information storage unit 11 for control information (flow entry) having a matching condition that matches the received packet, and the processing contents (designation specified in the instruction field) (Transfer from port, rewrite header, discard, etc.)
  • control information flow entry
  • the source MAC address SMAC
  • DMAC destination MAC address
  • control information (flow entry) having matching conditions that match the received packet does not exist in the control information storage unit 11
  • the packet processing unit 12 sends the received packet to the control device 20 via the protocol processing unit 15. Is transmitted to request generation / transmission of control information (flow entry) (corresponding to the Packet-In message of Non-Patent Document 2). Note that the operation for requesting transmission of control information (flow entry) is also executed when it is set as an instruction of control information (flow entry).
  • the layer 2 transfer unit 13 holds the MAC address table and performs the following operations. First, when receiving a packet, the layer 2 forwarding unit 13 refers to the source MAC address of the ether frame header of the packet, and if there is no corresponding entry in the MAC address table, it corresponds to the MAC address and the receiving port. And register it in the MAC address table. When there is an entry corresponding to the MAC address table, the layer 2 transfer unit 13 outputs a received packet from the port associated with the MAC address. If there is no corresponding entry in the MAC address table, the layer 2 forwarding unit 13 outputs the packet from all ports except the input port (flooding).
  • the alternative control channel configuration unit 14 performs control from all ports connected to other switches.
  • An ARP (Address Resolution Protocol) packet for requesting resolution of the MAC address of the device 20 is output. This packet is transferred to the control device 20 by the operation in the adjacent switch, for example, when there is no control information (flow entry) having matching conditions matching the received packet described above in the control information storage unit 11.
  • the alternative control channel configuration unit 14 transmits a control packet to the control device 20 with the MAC address as a destination.
  • the control packet is delivered to the control device 20 via the layer 2 transfer unit 13 of the adjacent switch 10.
  • an alternative control channel is established.
  • the protocol processing unit 15 communicates with the control device 20 according to a predetermined protocol such as the open flow protocol of Non-Patent Document 2 and stores control information (flow entry) received from the control device 20 in the control information storage unit 11 In addition, an operation for deleting the control information (flow entry) instructed from the control device 20 from the control information storage unit 11 is executed.
  • the switch 10 including the layer 2 transfer unit 13 as described above may be configured by adding an alternative control channel configuration unit 14 to the switch specified as “Hybrid Switch” in Non-Patent Document 2. Yes (see “5.1 Pipeline Processing” in Non-Patent Document 2).
  • FIG. 9 is a diagram illustrating a configuration of the control device 20 according to the first embodiment. Referring to FIG. 9, a configuration including an alternative control channel management unit 21, a switch management unit 22, a packet packing / distribution unit 23, and a packet transmission / reception unit 24 is shown.
  • the alternative control channel management unit 21 is a module that manages information on a switch (relay switch) serving as an alternative route when the control channel is disconnected.
  • the alternative control channel management unit 21 includes a relay switch selection unit 211 and a relay switch management unit 212.
  • the relay switch selection unit 211 receives the ARP request packet from the switch 10 that has detected the disconnection of the control channel, the relay switch selection unit 211 refers to the relay switch management unit 212 and the ARP request packet has already established an alternative control channel (other switches First, the ARP request packet is received first, and the ARP response has been transmitted), and then the ARP response packet is transmitted.
  • FIG. 10 is an example of relay switch information held by the relay switch management unit 212.
  • the IP address of the switch that detected the disconnection of the control channel is stored in the control channel connection destination switch field, and the switch and its port information on the alternate control channel of the switch are stored in the relay switch field. ing.
  • the relay switch selection unit 211 When receiving the ARP request packet, the relay switch selection unit 211 checks whether an entry corresponding to the transmission source switch already exists. As a result of the confirmation, if there is no entry corresponding to the transmission source switch, the relay switch selection unit 211 relays the ARP request packet transmission source switch information and the ARP to the relay switch management unit 212. The switch information is stored, and a response to the transmission source of the ARP request packet is transmitted. On the other hand, as a result of the confirmation, if an entry corresponding to the transmission source switch already exists, information necessary for constructing the alternative control channel (the MAC address of the control device 20) has already reached the transmission source switch 10. The relay switch selection unit 211 discards the ARP request packet.
  • the switch management unit 22 is a module that manages a switch connected to the control device 20. For example, in response to a control information (flow entry) transmission request (Packet-In message) from each switch 10, an operation of generating and transmitting control information (flow entry) is performed.
  • the switch management unit 22 holds a network topology constituted by the switch 10 and port information held by each switch in order to generate the control information (flow entry).
  • the packet packing / distributing unit 23 performs an operation of encapsulating a packet to be transmitted to the switch 10 or assembling a packet received from the switch 10 and distributing the packet to the alternative control channel management unit 21 or the switch management unit 22. Specifically, the packet packing / sorting unit 23 transfers the ARP request packet transferred from the switch 10 to the alternative control channel management unit 21, and receives the ARP response packet output from the alternative control channel management unit 21 as a packet. The operation to output to the transmission module is performed.
  • the packet transmission / reception unit 24 is a module that transmits and receives packets to and from the switch 10 via the control channel or the alternative control channel.
  • the control device 20 as described above can be configured by adding an alternative control channel management unit 21 and a packet distribution function to the alternative control channel management unit 21 based on the OpenFlow controller of Non-Patent Document 2. it can.
  • the units (processing means) of the switch 10 and the control device 20 shown in FIG. 1 are realized by a computer program that causes a computer constituting these devices to execute the above-described processes using the hardware. You can also.
  • FIG. 11 is a diagram illustrating an initial setting operation performed by the control device 20 according to the present embodiment.
  • the control device 20 sets control information (flow entry) that causes each switch 10 to execute the following processes (1) to (3) as an initial setting.
  • (1) The packet addressed to the control device 20 is transferred by the layer 2 transfer unit 13.
  • the second control information (flow entry) from the bottom in FIG. 8 is set in each switch.
  • DMAC destination MAC address of the control device from the normal port (layer 2 reserved port)
  • the normal port (layer 2 reserved port) is equivalent to the “Normal” port defined as a reserved port of “Hybrid Switch” having a layer 2 transfer function in Non-Patent Document 2.
  • the packet from the control device 20 is transferred by the layer 2 transfer unit 13.
  • the first control information (flow entry) from the bottom in FIG. 8 is set in each switch.
  • SMAC source MAC address of the control device from the normal port (layer 2 reserved port)
  • a packet that is a packet from the control device 20 and whose destination MAC address is the MAC address assigned to the port of the own device is determined to be a control packet addressed to the own device, and the alternative control channel configuration unit 14
  • the first and second control information (flow entry) from the top in FIG. 8 is set in each switch.
  • an instruction for outputting the packet from the local port is defined.
  • the local port is a port connected to the alternative control channel configuration unit 14 inside the switch, and is equivalent to a “Local” port defined as a reserved port in Non-Patent Document 2.
  • control information (flow entry) shown in FIG. 8 As described above, by setting the control information (flow entry) shown in FIG. 8 in each switch, the initial setting is completed, and an alternative control channel can be configured. Note that part of the matching conditions of the control information (flow entry) that realizes the above processing is matched. For this reason, in the example of FIG. 8, a high priority is given so that control information (flow entry) in which a finer match condition is set is preferentially applied.
  • FIG. 12 is a diagram illustrating an operation when the control channel disconnection is detected in the switch 10-1 of the present embodiment. As shown in FIG. 12, when the switch 10-1 detects disconnection of the control channel, the switch 10-1 transmits the ARP request packet of the control device from the ports connected to the other switches 10-2 and 10-3.
  • Transfer of the ARP request packet to the control device 20 in FIG. 13 can also be realized by setting control information (flow entry) for transferring the ARP request packet to the control device 20 in each switch at the time of initial setting.
  • the control device 20 that has received the ARP request packet selects one of the switches 10-2 and 10-3 as a relay switch, specifies a connection port with the switch 10-1, and instructs the output of the ARP response packet. .
  • the control device 20 since the ARP request packet from the switch 10-2 has arrived at the control device 20 first, the control device 20 selects the switch 10-2 as a relay switch, and from its port # 2-1 An instruction to transmit an ARP response packet is given.
  • the output of the ARP response packet is instructed using the Packet-Out message of Non-Patent Document 2.
  • the switch with the earlier arrival of the ARP request packet (that is, the shorter channel length) is selected as the relay switch.
  • the control device 20 performs the performance and position of each switch (actual Or the like on the shortest route).
  • the switch 10-2 Upon receiving the Packet-Out message instructing the output of the ARP response packet, the switch 10-2 outputs the ARP response packet from the port designated by the Packet-Out message, as shown in FIG. As a result, the ARP response packet from the control device 20 reaches the switch 10-1.
  • the alternative control channel configuration unit 14 that has received the ARP response packet transmits a session connection request packet to the control device 20 from the port that has received the ARP response packet.
  • the switch 10-2 receives the session connection request packet, the switch 10-2 passes through the layer 2 transfer unit 13 according to control information (flow entry) that is set in the initial setting and transfers the packet addressed to the control device in layer 2.
  • control information flow entry
  • the control device 20 may suppress flooding by transmitting a packet that causes the layer 2 transfer unit 13 of the switch 10-2 to learn its own MAC address.
  • the control device 20 that has received the session connection request packet transmits a session connection response packet to the switch 10-1 via the switch 10-2.
  • the switch 10-2 receives the session connection response packet, the switch 10-2 follows the control information (flow entry) that is set in the initial setting and transfers the packet originating from the control device 20 in layer 2, and the layer 2 transfer unit 13 to the switch 10-1.
  • the layer 2 transfer unit 13 of the switch 10-2 learns the MAC address of the switch 10-1 and its port when transferring the session connection request packet, no flooding is performed.
  • an alternative control channel is established as shown in FIG. Thereafter, the control device 20 resumes the control of the switch 10-1. If this alternative control channel is also disconnected, the above-mentioned [ARP request transfer after disconnecting control channel] process is executed again, so that the alternative control with the switch 10-3 as a relay switch is performed.
  • a channel can be built.
  • control channel it is possible to realize redundancy of the control channel without adding a physical link between the control device 20 and the switch 10.
  • the reason is that an alternative control channel can be configured as long as there is a physical path that can reach the control device 20 via another switch.
  • the present invention can also be applied to a network in which layer 2 switches that are not controlled by the control device 20 are mixed (second embodiment).
  • a layer 2 switch (hereinafter referred to as “L2 switch”) 30-1 is disposed between the control device 20 and the switches 10-1 to 10-4. Even in this case, when the link connecting the switch 10 and the L2 switch is disconnected, transmission of the ARP request packet is started as in the first embodiment, and an alternative control channel can be established by the same procedure. .
  • the L2 switch 30- is sent at the timing when the session connection request packet is transmitted from the control channel disconnection detection switch (for example, the switch 10-1). 1 will learn the MAC table.
  • the control device 20 may suppress flooding by transmitting a packet that causes the L2 switch 30-1 to learn its own MAC address.
  • the L2 switch 30-2 is also arranged between the switch 10-2 and the switch 10-3. Even in this case, the ARP request packet and the ARP response packet can be transferred without any problem. For example, if the control channel of the switch 10-2 in FIG. 17 is disconnected, the switch 10-2 also transmits an ARP request packet to the L2 switch 30-2. At this stage, the L2 switch 30-2 learns the MAC address of the switch 10-2. Then, the L2 switch 30-2 floods the ARP request packet, so that the ARP request packet reaches the switch 10-4. After that, as in the first embodiment, the switch 10-4 requests the control device 20 to generate and transmit control information (flow entry), so that the ARP request packet is transmitted to the control device 20. To reach.
  • the control device 20 selects the switch 10-4 as a relay switch, the control device 20 instructs the switch 10-4 to output an ARP response packet toward the L2 switch 30-2.
  • the L2 switch 30-2 since the L2 switch 30-2 has learned the MAC address of the switch 10-2, the ARP response packet reaches the switch 10-2. Further, the L2 switch 30-2 learns the MAC address of the control device 20 when receiving the ARP response packet. Therefore, the session connection request packet received from the switch 10-2 is also transferred to the control device 20 via the switch 10-4. Is done.
  • the present invention can also be applied to the In-band control method described in Non-Patent Document 3.
  • control information storage unit 10A, 10B, 10-1 to 10-4 switch 11 control information storage unit 12 packet processing unit 13 Layer 2 Transfer Unit 14 Alternative Control Channel Configuration Unit 15 Protocol Processing Unit 20, 20A Control Device 21 Alternative Control Channel Management Unit 22 Switch Management Unit 23 Packet Packing / Distribution Unit 24 Packet Transmission / Reception Units 30-1, 30-2 Layer 2 Switch (L2 switch) 211 Relay switch selection unit 212 Relay switch management unit # 1-1, # 1-2, # 1-3, # 2-1 port

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)

Abstract

La présente invention a pour objectif d'améliorer une propriété de résistance contre des problèmes de réseaux de type commande centralisée. Un appareil de commande réalise la commande d'un commutateur en établissant des informations de commande pour le commutateur via un canal de commande. Le commutateur comprend : une unité de traitement de paquet qui traite un paquet reçu sur la base des informations de commande qui ont été établies par l'appareil de commande ; une unité de transfert de couche 2 qui notifie un port d'entrée d'un paquet de commande entre l'appareil de commande et un autre commutateur et qui transfère le paquet de commande sur la base d'un résultat de la notification ; et une unité de configuration de canal de commande de substitution qui, lorsqu'elle a détecté un débranchement du canal de commande, transmet, à un commutateur adjacent, un paquet pour demander une solution de l'adresse de couche 2 de l'appareil de commande, acquiert l'adresse de couche 2 depuis l'appareil de commande via le commutateur adjacent, transmet un paquet de commande à l'appareil de commande par utilisation de l'adresse de couche 2 acquise, configurant de ce fait un second canal de commande entre le commutateur local et l'appareil de commande.
PCT/JP2014/054568 2013-02-26 2014-02-25 Système de communication, commutateur, appareil de commande, procédé et programme de configuration de canal de commande WO2014132967A1 (fr)

Priority Applications (3)

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JP2015502936A JP5987971B2 (ja) 2013-02-26 2014-02-25 通信システム、スイッチ、制御装置、制御用チャネルの構築方法及びプログラム
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JP2019041368A (ja) * 2017-08-25 2019-03-14 日本電信電話株式会社 転送装置、転送システム、転送方法、およびプログラム
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JP7186565B2 (ja) 2018-09-26 2022-12-09 住友重機械工業株式会社 射出成形システム、射出成形機

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JPWO2014132967A1 (ja) 2017-02-02
EP2963869A4 (fr) 2016-09-28

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